Primary Load Path Parts
Primary load path parts are those intended to control or regulate the movement of pressurized fluids (pressure controlling) and/or those whose failure to function as intended would result in the release of retained fluid to the atmosphere (pressure containing).
Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards
Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards